What is the riles for fire curtains?

Here are the rules for fire curtains:

### Installation Requirements

- **Width Restrictions**:

 - Except for atriums, if the width of the fire separation area is less than or equal to 30 meters, the width of the fire curtain should not exceed 10 meters.

 - If the width of the fire separation area exceeds 30 meters, the width of the fire curtain should not exceed one-third of that area.

- **Height and Installation**:

 - Fire curtains must be installed at the designated fire separation points, ensuring full coverage from floor to ceiling.

 - The height of the curtain should ensure a minimum drop of 1.8 meters below any openings it is designed to protect.

- **Fire Resistance Rating**:

 - The fire curtain must have a fire resistance rating appropriate for the building's design and local fire safety regulations, typically ranging from 2 to 4 hours.

- **Operation and Control**:

 - Fire curtains must be equipped with both automatic and manual control systems.

 - They should automatically deploy upon activation of smoke or heat detectors.

 - A manual override should be available for emergency use.

- **Smoke Sealing**:

 - Fire curtains should be equipped with effective smoke seals to prevent the passage of smoke through gaps around the curtain.

- **Regular Maintenance and Testing**:

 - Regular inspections and maintenance must be carried out to ensure proper operation in case of fire.

 - Functional testing should be conducted periodically as per local fire safety standards.

These rules may vary slightly depending on local building codes and fire safety regulations. It’s always best to consult local guidelines or a fire safety expert when installing or maintaining fire curtains.